The designer inspected the following classes in the file:
Visual Studio was able to identify all the classes in the file; following this error will be a list detailing why each class failed Visual Studio requirements.
The list may include one of the following specific errors:
The base class '<class name>' could not be loaded
The base class '<class name>' cannot be designed
The designer for base class '<class name>' is not installed
To correct this error
Derive from a base class that supports designers.
If the class is deriving from something within the project, like an inherited form or control, make sure the project is built by selecting Build Solution from the Build menu.
See Also
Tasks
How to: Prepare and Manage Builds
Reference
The base class '<class name>' could not be loaded